I've been working on an alternative sensor version for areas where natural conditions or people are likely to damage the device. The idea of a fully enclosed PVC sensor design came from my mentor session with Bruce Dominguez. While this design will be harder to install, it will be much more resilient to damage.
Currently I am working on modeling up the new design in fusion and creating a new BOM. I want to make sure all the parts are still easy to find and relatively low cost. My main concerns with the design are the buildup of debris that may occur at the holes in the PVC and the potential for ultrasonic signals to bounce around inside the chamber before making their way back to the sensor, skewing readings. The only real way to test these things is by actually building a prototype of the device.